1. Search for an address
2. Find out, what accesses this address
3. Do stuff in program
4. Double click on an opcode that accessed that address to get Extra info window
5. Now, without closing any of the previous windows, click on Cheat Engine window
6. Try to open all previously opened windows
7. ...
8. PROFIT!

Add a menu option named View to change between open windows in case "Show all windows in the taskbar" option isn't checked.
And since I couldn't access them anymore to close them, the new same windows also hid themselves. Had to use Process Hacker to bring them to front again.
But then again, I think it would be actually more logical to show all important windows in the taskbar by default.